Hi there.Was wondering if anyone can help me to solve this issue.Basicly engine on Idle not running smooth.On Idle there are something like 2 very light misfires I would say one after other.Rpm needle have almoast unnoticeable movement but I can feel it inside that it judders. Car drives fine and no any fault codes too.Have changed spark plugs and coils without any success.Also after turning ignition off engine kind of judders a bit.I was thinking about vacuum leak somewhere but after inspection and spraying carb cleaner on vacuum hoses didnt find anything.Any ideas are welcome guys.I ve been in couple of garages and they couldn't find anything what could cause problem so will have to figure it out my self

Check the inlet manifold/valves for carbon build up using a borescope and if necessary try an aerosol type product designed to clean via the air intake.

I will do that next week as friend of mine have borescope.Dont think any of those sprays work tho.To maintain after cleaning every couple of thousand miles that would do but to remove carbon buildup that causing lights coming up or affects engine functioning correctly only way to clean it would be removing manifold and doing manual cleaning on valves.

Is it random or a constant problem when hot or warming up? Although I have the 1.2tsi, since new it occasionally  'hiccups' during warm up on idle.

IF it's build up in the intake/valves the cheap spray may work for a while, you can have the valves done by abrasive blasting.

 

Given access a pressure washer with hot water and turbo type lance works wonders for a like new clean, just ensure the valves are fully closed on each cylinder you work on and blow dry with compressed air.

 

Check out DiagnoseDan: 

 

24 minutes ago, edbostan said:

Is it random or a constant problem when hot or warming up? Although I have the 1.2tsi, since new it occasionally  'hiccups' during warm up on idle.

Its constant and engine temperature doesnt change anything.

I know what you mean with that video but that is not my case.I am planning to do a valve clean my self  when will have a couple of days free.Also want to pull out injectors too and clean it

Looks as though these direct engines are not a good idea

They does require more maintanece.I have been driving my Octavia for about 30 thousand miles and cant realy complain.Have done all maintenance work on time with good quality oil and havent had any major issues with it.Now I have 102 thousand miles on clock